labour

Sense 1 noun

a social class comprising those who do manual labor or work for wages

there is a shortage of skilled labor in this field

Sense 2 verb

work hard

She was digging away at her math homework

Sense 3 noun

concluding state of pregnancy; from the onset of contractions to the birth of a child

she was in labor for six hours

Sense 4 verb

strive and make an effort to reach a goal

She tugged for years to make a decent living

Sense 5 verb

undergo the efforts of childbirth

Sense 6 noun

productive work (especially physical work done for wages)

his labor did not require a great deal of skill